Cumulative pregnancy rates of two strategies: Day 3 fresh embryo transfer followed by Day 3 or Day 5/6 vitrification and embryo transfer: a randomized controlled trial KU Leuven
STUDY QUESTION: Are cumulative pregnancy rates better if supernumerary embryos are vitrified on Day 5/6 instead of Day 3? SUMMARY ANSWER: The results do not show a significant difference in cumulative pregnancy rates between the Day 3 and Day 5/6 vitrification groups. WHAT IS KNOWN ALREADY: Pregnancy and live birth rates following IVF or ICSI treatment are higher after extended embryo culture and blastocyst transfer (Day 5/6) compared to ...